Zero Snippet

SQL formatter — pretty-print queries with dialect-aware indentation

Use this free online SQL formatter to turn dense one-line statements into readable indented SQL. Choose PostgreSQL, MySQL, SQLite, Transact-SQL, BigQuery, Snowflake, and other dialects, then apply uppercase or lowercase keywords for consistent SQL code review, documentation, and handoffs. Everything runs in your browser—no query upload—so it pairs well with other developer text tools on this site.

Formatted SQL

Formatting uses the sql-formatter library in your browser. Complex procedural scripts may need a different dialect or manual splits.

Why use a SQL pretty printer?

Readable SQL formatting shortens pull-request cycles: reviewers spot missing JOIN conditions, accidental cartesian products, and suspicious WHERE clauses faster when CTEs and subqueries align visually. Product and analytics teammates also benefit when you paste a beautified SQL snippet into Notion, Confluence, or Slack instead of a horizontal scroll of commas.

This page is optimized for ad-hoc use: no IDE extension install, no repo checkout. When you are already working with structured data in JSON or YAML, our JSON formatter, JSON to YAML, and XML formatter cover the same "make it legible before review" workflow for APIs and configs.

How to use this SQL formatter (step by step)

  1. Paste your query into the input panel—anything from a quick SELECT to a multi-CTE report. Strip log prefixes if the first line is not valid SQL.
  2. Choose the SQL dialect that matches your engine so string literals, comments, and vendor keywords tokenize correctly.
  3. Set keyword case (upper, lower, or preserve) and indentation (spaces or tabs) to mirror your team style guide.
  4. Click Format SQL, review the output, then Copy output into your ticket or editor. For pattern-heavy string work alongside SQL, the regex tester can help validate extract and replace logic separately.

Dialect-aware formatting vs generic pretty print

Generic text wrap breaks as soon as a dialect uses unusual quoting rules—think PostgreSQL dollar-quoted strings, SQL Server bracketed identifiers, or BigQuery backticks. A dialect-aware SQL formatter understands those tokens and keeps them intact while rearranging whitespace around clauses. If output looks wrong, switch dialects before assuming your query is invalid.

SQL style guides: keywords, identifiers, and joins

Many teams standardize on uppercase SQL keywords and lowercase or snake_case column names. Consistent indentation for INNER JOIN and LEFT JOIN chains makes it obvious which table supplies filter predicates in the WHERE clause versus join keys in the ON clause. This tool automates the tedious part so you can focus on logic.

Security and privacy when formatting SQL

Even though formatting is client-side, pasted SQL may still contain PII in literals or comments. Treat the textarea like any other clipboard surface: redact before sharing screenshots. For token inspection (not SQL), the JWT decoder and Base64 encoder are separate utilities with the same local-only philosophy.

Related free developer tools

Explore the full code and developer tools collection for formatters, encoders, and converters. Highlights below complement this SQL formatter for everyday engineering work.

  • JSON Formatter & Validator — Format, validate, minify, and explore JSON in a collapsible tree—fix payloads before they hit production.
  • JSON to CSV Converter — Turn JSON arrays into downloadable CSV with automatic column detection for spreadsheets and BI tools.
  • JSON to YAML Converter — Convert JSON to readable YAML for configs and Kubernetes—copy or download the result.
  • CSV to JSON Converter — Paste or upload CSV and get structured JSON with header-aware typing for APIs and apps.
  • YAML to JSON Converter — Parse YAML to valid JSON with clear errors—ideal for CI configs and cloud templates.
  • XML Formatter & Validator — Beautify and validate XML with structure insight and actionable parse errors.
  • Regex Tester & Debugger — Test patterns live with highlights, capture groups, and flags—debug regex without leaving the browser.
  • HTML Formatter & Minifier — Beautify or minify HTML and compare raw markup with a quick rendered preview.
  • CSS Formatter & Minifier — Format messy stylesheets or minify CSS for faster loads—keep design tokens consistent.
  • JavaScript Formatter & Minifier — Pretty-print or minify JavaScript for debugging locally and shipping smaller bundles.
  • HTML to Markdown Converter — Convert HTML snippets to Markdown for docs, CMS migrations, and README cleanup.
  • Markdown to HTML Converter — Turn Markdown into HTML with a live preview—handy for emails, blogs, and static pages.
  • Code Diff Checker — Compare two code blocks side by side with clear add/remove highlighting for reviews.
  • JWT Decoder — Decode JWT header and payload and check expiry—signature verification not included, client-side safe.

Frequently asked questions

What does this online SQL formatter do?
It pretty-prints SQL in your browser: consistent indentation, line breaks, and optional keyword casing so SELECT, FROM, WHERE, JOIN, and subqueries are easy to scan. Pick a dialect so comments, dollar-quoted strings, and vendor-specific syntax are handled more predictably than with a naive text wrap.
Is my SQL sent to your servers?
No. Formatting runs entirely in your browser using an open-source formatter. Your queries never leave the tab, which makes the tool suitable for staging snippets and anonymized samples as long as you still follow your own security policies for secrets in connection strings or literals.
Which SQL dialect should I choose?
Match the engine you run against: PostgreSQL for Postgres and compatible warehouses, MySQL or MariaDB for those ecosystems, SQLite for apps and local dev, Transact-SQL for Microsoft SQL Server, PL/SQL for Oracle-style blocks, BigQuery or Snowflake for cloud analytics. When unsure, generic SQL mode is a reasonable default for simple SELECT statements.
Will formatting change the meaning of my query?
Only whitespace and letter case of keywords and identifiers change—never numeric literals or string contents. You should still run the formatted SQL in a non-production database or transaction when the query performs writes, because typos you paste in are preserved.
Why does formatting fail on my query?
The formatter expects text that mostly looks like SQL. Unclosed quotes, mixed-in shell or log prefixes, or heavy procedural code in an unsupported dialect can confuse the lexer. Trim surrounding noise, try another dialect, or split very large scripts into smaller statements.
How is this different from my IDE formatter?
IDE formatters are tied to your project and often use the same libraries under the hood. This page is a zero-install option for sharing readable SQL in tickets, docs, and pull request descriptions when you only have a browser.
Can I minify SQL here?
This tool focuses on readability. Minified one-line SQL is harder to review and can obscure mistakes. If you need smaller payloads for rare edge cases, use your driver or a dedicated pipeline—most databases do not require minified SQL for performance.
Does uppercase keywords help performance?
No. Engines parse SQL regardless of keyword case. Uppercase is a human convention for scanning and code review, not an optimization.